LDK130C33R

Overview

The LDK130C33R is a low-dropout linear voltage regulator manufactured by STMicroelectronics, designed for low-power applications. It provides a fixed output voltage of 3.3 V with a maximum output current capability of 300 mA. The device operates within an input supply voltage range of 1.9 V to 5.5 V and exhibits a typical dropout voltage of 100 mV at a 100 mA load. Key electrical characteristics include a low quiescent current of 30 µA and a shutdown mode consumption lower than 1 µA when enabled via logic control. The regulator features very low noise output and maintains stability using a ceramic capacitor of 1 µF on the output. It offers an output voltage tolerance of ±2.0% at 25 °C and includes internal short-circuit constant current limiting and thermal protection mechanisms.

Feature Summary

• Logic-controlled electronic shutdown function enables total current consumption below 1 µA in off mode
• Compatible with small-size ceramic output capacitors (1 µF) for stable operation
• Integrated short-circuit constant current limiting and thermal protection for enhanced reliability

Applications

• Low-power battery-powered consumer electronics
• Automotive systems requiring AEC-Q100 qualified components
• Noise-sensitive analog or RF circuit power supplies

Procurement Notes

Verify the specific package variant upon ordering, as the LDK130 series supports SOT23-5L, SOT323-5L, and DFN6 packages. Confirm that the automotive-grade qualification applies to the required package type, as specifications may vary between standard and automotive versions. Ensure the selected part matches the required output voltage tolerance and operating temperature range for the target application environment.

Selection Notes

Select this component for designs requiring a fixed 3.3 V rail with minimal static power draw. The low dropout characteristic allows efficient regulation from sources close to the output voltage. Verify that the load current does not exceed 300 mA and that the input voltage remains within the 1.9 V to 5.5 V operational window. Consider the thermal dissipation capabilities based on the chosen package and ambient temperature conditions.

Part Context

The LDK130C33R belongs to the LDK130 family of low-dropout regulators from STMicroelectronics. This family is characterized by ultra-low noise and low quiescent current, targeting portable and automotive applications. The C33 suffix denotes the fixed 3.3 V output version. The series is available in multiple surface-mount packages to accommodate different board space and thermal requirements.

Replacement Considerations

Direct substitutes within the same family include other LDK130 variants with different fixed output voltages, provided the voltage requirement changes. Cross-family replacements must match the 300 mA current rating, 1.9–5.5 V input range, and SOT323-5 or equivalent package footprint while verifying pin compatibility.